How does a fault code arise in the VVT and Valvetrain group?
This group collects codes related to variable valve timing (VVT) and the valvetrain: camshaft actuators, oil control valves (OCV), camshaft position sensors and, where fitted, variable valve lift mechanisms.
What VVT systems have in common is that they are hydraulic: the force that rotates the camshaft is engine oil pressure. The control unit targets an angle, drives the oil control valve and reads the achieved angle from the camshaft sensor. If the target is not reached, a code is stored.
The diagnostic consequence is that most codes in this group are not electrical. Dirty or low oil, a blocked oil control valve screen or low oil pressure will set a code even on a mechanically healthy VVT system. Check the oil service history and oil pressure before replacing an actuator.
Fault codes in this group
The database holds 19 codes in this group. Each code has its own page with the meaning, possible causes and diagnostic steps:
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Data source: the CarCoding fault code database. Code definitions follow the SAE J2012 standard; manufacturers may use different wording for their own codes. Everything on this page is generated from the code-specific database records.